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IDS Forum

Re: Tool to check corrupted index

Posted By: ART KAGEL, BLOOMBERG/ 731 LEXIN
Date: Friday, 9 March 2007, at 10:28 a.m.

In Response To: Tool to check corrupted index (PATRICK LEY)

No such tool. IDS doesn't know that an index is corrupted, so it cannot tell
you in a sysmaster query for example. I would just run the oncheck -cDI (DO
include the 'D' so that the indexes are checked for missing rowids - without the
D only internal consistency of the index is verified not completeness) for one
table at a time and repair any corrupted indexes that each run finds (rebuild
the indexes manually in dbaccess or sqlcmd DO NOT let oncheck fix them it's too
slow!) before performing the oncheck run for the next table. That should keep
the server from crashing.

Note that I have found that indexes mainly get corrupted in databases that have
logging turned off when the server crashes or the system crashes or is shutdown
without bringing the IDS engine offline first. Turn on logging and you will
find MANY fewer trashed indexes.

Art S. Kagel

----- Original Message -----
From: Patrick Ley <ids@iiug.org>
At: 3/09 10:18:36

Hi all,

My client have a situation where after reboot, informix keep on dumping af
file and complaining about inconsistency of indexes.

Honestly i do not have a full idea what has been done at customer site but i
do suspect that there is an abnormal shutdown.

So we use the tool onchecl -cI <dbname> to scan the entire db with the hope to
know all the corrupted indexes. But problem is after scanning for x number of
tables with corrupted indexes informix will have a PANIC shutdown.

The informix version is IDS 9.30.FC6 running on SUN OS.

My question is is there a tool out there where i can detect all the corrupted
indexes without causing informix to have af file dump? oncheck utility just
couldn't suite our needs.

*******************************************************************************
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